一年级数学上册第5单元6_10的认识和加减法《加减混合》课件新人教版.ppt

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加减混合,9-3-4 你是怎么算的? 9-3-4=24+3+2 你是怎么算的? 4+3+2=9,复习引入,1,3,10,3,9,6,1,2,7,6,10,新授,4 + 3 2 =,7,5,新授,4 2 + 3 =,2,5,知识延伸,3,4,4,+,-,知识延伸,车上原来有6人。,车上现在有多少人?,6 5 + 8 =,9,知识延伸,解决问题,8,-,3,+,2,7,练习,数一数,算一算,( )朵,( )朵,( )朵,3,5,2,练习,7,-,3,+,4=,8,4,练习,连一连,练习,比一比,看谁做得最好,9 5 + =7,8 +3 =6,3+4 =5,9 + = 6,5 + = 4,2 + + = 9,2,5,3,5,2,5,2,5,6,练习,一排小动物在做游戏,小白兔从左边数是第3, 从右边数是第5,请同学们算一算这一排小动 物共有几只?,算一算,小结,加减混合的运算顺序:从左到右计算,

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